MTA:SA anti-cheat code
MTA:SA anti-cheat code SD#16
MTA's anti-cheat could not start.
How to fix it
Repair your MTA installation
Run the current installer from multitheftauto.com over your existing installation. It replaces MTA's own files without touching your settings.
Let MTA start fully
Security software that blocks part of MTA can stop the anti-cheat starting. Allow MTA, then start it again.
Read the whole message, then the official page
The number names a detection category, not a program on your computer. MTA's anti-cheat guide lists what each category covers, and the full message is what tells you which case you are in.
Still not fixed? Copy the whole message, not only the code, and check your log in the Fix tool. It is read on your own computer.
About this code
SD codes are special detections a server can switch on. Most of them are about the environment MTA is running in: a virtual machine, a blocked component, or a program that can change how the game runs. MTA's own documentation gives SD#16 as Anti-cheat startup failure.
All fix guides · Every MTA:SA error code · Crash codes and offsets
Where this comes from
Read on 5 September 2026 and written in our own words here.